Pipe-coupling



E. BECK.

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UNITED STATES PATENT OFFICE.

EDIVARI) BECK, OF CHICAGO, ILLINOIS.

PIPE-COUPLING.

SPECIFICATION forming part of Letters Patent No. 407,151, dated July 16, 1889.

Application iled July 25, 1888. Serial No. 230,995. (No model.)

To all whom, t may concern:

Be it known that I, EDWARD BECK, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Pipe-Couplings, of which the following is a specification.

My invention relates to stove-pipe couplings; and it has for its object to provide ilnproved means for locking two sections of pipe together at any desired extension, whereby the necessity for half and other fractional sections is obviated, the said locking means being so disposed as to prevent the sections from telescoping.

\Vith this object in view the invention consists in a certain novel construction and arrangement of devices, fully set forth hereinafter in connection with the accompanying drawings, wherein- Figure 1 is a side view ol' two sections of pipe connected by the improved coupling'. Fig. 2 is a vertical central sectional view. Fig. 3 is a horizontal sectional view on the line of Fig. 1.

Referring to the drawings, A A represent the sections of pipe. The lower section is provided with the vertical ratchet-bar l,having a vertical groove C parallel with its side edge, the said bar being preferably fitted in a vertical slot D in the side of the pipe and provided with lateral flanges E, which are secured to the pipe on opposite sides of the slot. The upper section is provided with an aperture F, over which is secured the casting G, having the vertical slot II and the outstanding ears I I. A gravity-pawl K is mounted between the ears I, with its engaging end or tip projecting through the slot II and the aperture in the side of the pipe and engaging the ratchet. The handle L of the pawl is arranged outside of the pipe, its weight normally holdin gthe engaging end of the pawl in en gagement with the ratchet. \Vhenin its normal position,the handle of t-he pawl bears against the lower end of the casting, thereby preventing the engaging end of the pawl from swinging upward and allowing the upper section to slide downward.

The under side of the casting is provided with the rib M, which fits and slides in the groove C in the ratchet-bar, thereby guiding the pipes and preventing independent rotation thereof.

The manner of operating the device will be evident. The upper pipe may be raised to the desired height, but cannot be lowered without previously raising the pawl, and thus disengaging it from the ratchet. I/Vhen the upper section is raised, the handle of the pawl may be swung outward, thereby drawing the engaging end or tip of the pawl downward out of range of the teeth of the ratchet. Then the pawl is in this position, it is obvious that the sections of pipe are capable of free relative movement; but when the pawl is released its handle swings downward, thereby throwing the engaging end or tip into position to engage the ratchet.

It will be seen that the weight of the upper section is sustained by the pawl when the latter is in engagement with the ratchet, and therefore the handle is pressed firmly against the side of the pipe, and when it is desired to disengage the pawl to adjust the sections relatively it is necessary to raise the upper section slightly, and thereby allow the tip of the pawl to clear the tooth with which it is engaged.

lleretot'orc various devices for coupling independently-1novable sections of stove-pipe have been used,and a gravity-pawl engaging a ratchet has also been `frequently employed; but they have been subject to various obj ectionswnamely, they are cumbersome and awkward, they necessitate a special formation or preparation of the pipe, dac.

In applying the improved coupling to a stovepipc the latter must simply be cut to form slots to receive the ratchet-bar and cast ing, and therefore the above-mentioned disadvantages are obviated.

Having thus described my invention, I clain1- l. In a pipe-coupling, the lower pipe-section provided with a vertical slot, the ratchet-bar arranged in the said slot and provided with lateral flanges secured to the pipe on opposite sides of the slot, combined with the upper pipe-section surrounding the lower section and sliding thereon, the casting G, secured to the upper section and provided with a verti- TOO cal rib M, operating in a longitudinal groove C in the ratehebbar to prevent independent rotary movement of the pipe-seotions, and the gravity-pawl K, pivoted between outstanding ears on the Casting and engagin g the ratchetbar, substantially as specified.

2. In a pipe-coupling, the vertical ratchetbar secured to thelower pipe-section and provided with a longitudinal groove C, Combined with the casting secured to the upper pipesection and provided with a rib M, operating in the groove C, and the gravity-pawl pivoted on the casting and engaging the ratchet-bar,

EDWARD BECK;

Vitnesses:

J. FRANK RICHMOND, ANDREW MARSHALL. 

